| # | Company | Employees |
|---|---|---|
| 1 |
ENERCONenercon.de
Development and manufacturing of innovative gearless onshore wind turbines with advanced rotor blade, control, and grid connection technology worldwide. |
6,634 |
| 2 |
PowerCopowerco.de
Global battery activities are managed by PowerCo, focusing on cell technology, factory operations, vertical integration, and supplying machinery Planning major energy grid storage systems |
2,389 |
| 3 |
Avacon Gruppeavacon.de
A regional energy service provider delivering energy solutions in electricity, gas, water, heating, cooling, telecommunications, mobility, and lighting in Germany |
1,157 |
| 4 |
enercityenercity.de
One of the largest energy service providers in Germany supplying electricity, heat, natural gas, and drinking water with a focus on sustainability and customer support |
998 |
| 5 |
STIEBEL ELTRON Groupstiebel-eltron.com
Providing high-efficiency heating, cooling, ventilation, and water heating solutions powered by renewable energy, driving the energy transition with innovative, future-proof systems globally |
947 |
| 6 |
Avacon Netz GmbHavacon-netz.de
This German-based organization operates in the utilities sector, providing essential services to the local community in Salzgitter-Salder |
803 |
| 7 |
EWE NETZewe-netz.de
Regional energy and telecommunications network operator enabling the energy transition with nearly 100% renewable energy, focusing on innovative solutions for cost-effective transition |
651 |
| 8 |
Neptune Energyneptuneenergy.de
Extraction of natural gas and crude oil in Germany, focusing on low emissions, sustainability, and future energy solutions like lithium and geothermal. |
603 |
| 9 |
Federal Company for Radioactive Waste Disposalbge.de
Federally owned company managing and disposing of radioactive waste, responsible for repositories, site selection, and product control in Germany Environmental and human protection is top priority |
600 |
| 10 | 514 | |
| 11 |
Piller Power Systemspiller.com
Designs and manufactures high-end power protection systems for mission-critical applications including banks, broadcasters, airports, and telecommunications worldwide. |
463 |
| 12 |
EEW Energy from Waste GmbHeew-energyfromwaste.com
A leading European company specializing in thermal waste and sewage sludge disposal, converting waste into energy, reducing volume, and promoting circular economy and sustainability |
422 |
| 13 |
PNEpnegroup.com
This company is an experienced project developer of onshore and offshore wind farms, offering clean energy solutions including photovoltaics, storage, and hydrogen technology |
388 |
| 14 |
Alterricalterric.com
Alterric develops, plans, and operates wind parks in Germany and Central Europe, aiming to expand renewable energies for a sustainable, green future |
374 |
| 15 |
PreussenElektrapreussenelektra.de
A part of the EON Group, we are responsible for decommissioning eight nuclear power plants in Germany, transitioning to future-oriented solutions at our sites |
329 |
| 16 |
SCHULZ Systemtechnikschulz.st
A leading developer of automation solutions combining mechanics, electrical engineering, and software to offer tailored solutions for various industries globally |
328 |
| 17 |
United Offshore Support GmbHuos.ag
Leer-based service provider to the offshore industry, offering commercial and technical management, crew services, marketing, chartering, and operations for global offshore activities |
295 |
| 18 |
BS|ENERGYbs-energy.de
An energy provider offering reliable services nationwide, including public lighting, wastewater disposal, and innovative solutions for smart cities and businesses |
241 |
| 19 |
EnviTec Biogas AGenvitec-biogas.com
This company specializes in the entire biogas production value chain, including planning, construction, and operation of biogas plants and upgrading facilities |
215 |
| 20 |
Stemmann-Technik GmbH - a Wabtec Companystemmann.com
A leading manufacturer of energy and data transfer components for industrial and transport technology, with a focus on quality, innovation, and reliability |
183 |
| 21 | 152 | |
| 22 |
GETEC ENERGIEgetec-energie.de
Since 2001, this company provides comprehensive energy services to consumers, providers, and producers They focus on making energy procurement, delivery, and marketing efficient and sustainable |
131 |
| 23 |
Prowind GmbHprowind.com
Specialized in national and international renewable energy project development since 2000, with wind energy as its core business, from acquisition to operation. |
98 |
| 24 |
Ems Maritime Offshore (EMO)offshoreservice.de
A subsidiary providing tailored offshore service solutions with a modern fleet for wind farms, offering maritime coordination and logistical support |
68 |
| 25 |
Volkswindvolkswind.de
Plans, projects, builds, and operates wind power plants, focusing on growth markets with high-quality standards and local expertise. |
57 |
| 26 |
Stadtwerke Lingen GmbHstadtwerke-lingen.de
A customer-focused energy provider and service company, offering affordable energy and water supply, promoting environmental sustainability, and providing innovative solutions for energy needs |
28 |
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 2, 2026.
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